I don't know if the DTB sales curve is necessarily flatter - ebooks in the long run are probably a much better long tail venue than print.
But Amazon does offer 4 to 5 as many print books as Kindle books. There are still only 700,000 books in the Kindle Store, and the print database runs into the millions. That makes it a little more difficult to compare the sales performance of the different media without picking a set of books to look at side to side.
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